Why not go and call? He remembered that Ellen had asked him to drop in sometimes and there was Rosemary’s book to take back—he ought to take it back before he forgot. He had an uneasy suspicion that there were a great many books in his library which he had borrowed at sundry times and in divers places and had forgotten to take back. It was surely his duty to guard against that in this case. He went back into his study, got the book, and plunged downward into Rainbow Valley.